<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let arr = []
        for(let i = 0; i <= 99; i++){
            arr.push(i)
        }
        length = 9
        [1,2,3,4,5,6,7,8,9]
        // 0 1 2 3 4 5 6 7 8 

        //arr[3] === 4
        // arr.splice(3,1)
        //arr[3] === 5

        console.log(arr);

        let result = []
        let itemTotal = 100
        for(let j = 0; j < 10; j++){
            let index = Math.floor(Math.random() * itemTotal)

            result.push(arr.splice(index,1)[0])

            itemTotal -= 1
            //console.log(arr[Math.floor(Math.random() * 100)])
        }
        console.log(result)
    </script>
</body>
</html>